Contactless Card Assembly With UV-Cured Antenna Isolation
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Solution Overview
Problem
The challenge in fabricating metal contactless transaction cards lies in precisely bonding an electrically conductive antenna to a metallic card body without electrical shorting, due to the imprecise lamination of layers and potential accidental contact with conductive materials.
Innovation Solution
A method involving a card body with a defined window, an antenna assembly layer with curable connectors and a UV-transparent layer, where the antenna is supported and the chip module is electrically connected through these connectors, preventing contact with the metallic card body by using a UV-transparent layer and insulating materials to ensure precise assembly and electrical isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If lamination is used to bond the antenna to the card body, then assembly is simplified, but manufacturing precision deteriorates due to imprecise bonding and potential accidental contact with conductive materials
Solution Approach 1:
An insulating layer is introduced as an intermediary between the conductive antenna and the metallic card body. This insulating layer prevents direct electrical contact while maintaining the structural bonding function, thereby resolving the contradiction between assembly simplicity and bonding precision by adding a mediating element that eliminates the harmful electrical connection.
2Reliability
If conductive material is used for bonding, then electrical connection is achieved, but electrical shorting occurs due to accidental contact with the metallic card body
Solution Approach 1:
The insulating layer serves as a mediator that allows mechanical bonding while preventing electrical contact. This resolves the contradiction by introducing an intermediate substance that permits the bonding function to occur without enabling the harmful electrical shorting effect.
Solution Approach 2:
The insulating properties are applied locally at the critical interface between the antenna and card body, rather than requiring the entire structure to be non-conductive. This allows the antenna to maintain its conductive functionality while preventing shorting at specific locations where contact with the metallic body could occur.
3Adaptability or versatility
If the antenna is placed within the window, then wireless communication functionality is enabled, but electrical isolation from the card body becomes more difficult
Solution Approach 1:
The insulating layer is positioned within the window area to provide electrical isolation between the antenna and card body while allowing the antenna to be placed in the required location for wireless communication. This mediator enables both the contactless functionality and the electrical isolation to coexist.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for the robust and precise assembly of contactless transaction cards, preventing electrical shorting and ensuring reliable wireless communication, while maintaining the metallic card body's conductivity.
Implementation Method 1
directing radiation through the UV-transparent layer, wherein the contactless chip module is electrically connected to the antenna via the curable connectors
Data Source
AI summary
A method of forming a contactless transaction card. The method may include providing a card body, defining a window, and attaching an antenna assembly layer to the card body, where the antenna assembly layer includes an antenna, a set of curable connectors, disposed on a set of end regions of the antenna within the window, and a UV-transparent layer, supporting the antenna. The method may include providing a contactless chip module within the window on a first side of the antenna assembly layer, and directing radiation through the UV-transparent layer, wherein the contactless chip module is electrically connected to the antenna via the curable connectors.